1. e-mail

1.1. gmail

1.2. windows live hotmail

2. blog

2.1. wordpress

2.2. blogger

3. social networks

3.1. twitter

3.1.1. A global community of friends and strangers answering one simple question: What are you doing? Answer on your phone, IM, or right here on the web.

3.2. facebook

3.2.1. Facebook is a social utility that connects people with friends and others who work, study and live around them. People use Facebook to keep up with friends, upload an unlimited number of photos, post links and videos, and learn more about the people they meet.

4. RSS feeds

4.1. google reader

4.2. feed demon

5. bookmarking

5.1. delicious

5.1.1. Delicious let you keep links to your favorite articles, blogs, music, restaurant reviews, and more and access them from any computer on the web. Share favorites with friends, family, and colleagues. Discover new things. Everything on delicious is someone's favorite - they've already done the work of finding it.

5.2. diigo

5.2.1. Diigo (dee'go) is about Social Annotation. By combining social bookmarking, clippings, in situ annotation, tagging, full-text search, easy sharing and interactions, Diigo offers a powerful personal tool and a rich social platform for knowledge users, and in the process, turns the entire web into a writable, participatory and interactive media.